化简图4-2方框图,并求出系统传递函数,,系统,传递函数,求出,方框图,简图, 图4-2 对图4-2化简如下: 图4-2a 图4-2b W(S)=Y(S)/X(S) ={W1(S)W2(S)/[1+W1(S)W3(S)W4(S)]}/{1+W1(S)W2(S)W4(S)/[1+W1(S)W3(S)W4(S)]} ...